body {
    max-width: 540px;
    min-width: 320px;
    margin: 0 auto;
    font: normal 14px/1.5 Tahoma, "Lucida Grande", Verdana, "Microsoft Yahei", STXihei, hei;
    color: #000;
    background: #f2f2f2;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

ul,
ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    color: #222;
}

div {
    box-sizing: border-box;
}

.focus {
    position: relative;
    padding-top: 44px;
    width: 100%;
}

.focus img {
    width: 100%;
}

.focus ul {
    overflow: hidden;
    width: 500%;
    margin-left: -100%;
}

.focus ul li {
    float: left;
    width: 20%;
}

.focus ol {
    position: absolute;
    bottom: 5px;
    right: 5px;
    margin: 0;
}

.focus ol li {
    display: inline-block;
    width: 5px;
    height: 5px;
    background-color: #fff;
    list-style: none;
    border-radius: 2px;
    /* CSS3 过度属性 有过度动画 */
    transition: all .3s;
}

.focus ol li.current {
    width: 15px;
}